最初我有两个 PV/dev/nvme0n1p2和 ，/dev/nvme1n1p1其中包含各种镜像 LV。
我最近添加了两个新的更大容量的 PV/dev/nvme2n1p1和/dev/nvme3n1p1，并扩展了一个 LV ( home/windows-persistent) 以利用新空间。
然而，我注意到 LV 现在分布在所有 4 个 PV 上，而我更喜欢它只分布在 2 个 PV 上，因此我尝试使用以下命令将 LV 移动到新的 PV 上pvmove：
lvm> pvmove /dev/nvme0n1p2 -n home/windows-persistent /dev/nvme2n1p1
Insufficient free space: 57793 extents needed, but only 0 available
Unable to allocate mirror extents for home/pvmove0.
Failed to convert pvmove LV to mirrored.
lvm> pvmove /dev/nvme1n1p1 -n home/windows-persistent /dev/nvme3n1p1
Insufficient free space: 57793 extents needed, but only 0 available
Unable to allocate mirror extents for home/pvmove0.
Failed to convert pvmove LV to mirrored.
LVM 为何抱怨可用空间不足？我该如何正确移动 LV？
pvdisplay/ vgdisplay/lvdisplay输出：
lvm> pvdisplay -m
--- Physical volume ---
PV Name /dev/nvme0n1p2
VG Name home
PV Size 476.74 GiB / not usable 0
Allocatable yes
PE Size 4.00 MiB
Total PE 122046
Free PE 2812
Allocated PE 119234
PV UUID n6vD1c-pF3t-mqlg-g4Ge-HPT7-FwOC-p7t6wK
--- Physical Segments ---
Physical extent 0 to 51199:
Logical volume /dev/home/dom0
Logical extents 0 to 51199
Physical extent 51200 to 51200:
Logical volume /dev/home/windows-persistent_rmeta_0
Logical extents 0 to 0
Physical extent 51201 to 89600:
Logical volume /dev/home/windows-persistent_rimage_0
Logical extents 0 to 38399
Physical extent 89601 to 89601:
Logical volume /dev/home/windows_rmeta_0
Logical extents 0 to 0
Physical extent 89602 to 99841:
Logical volume /dev/home/windows_rimage_0
Logical extents 0 to 10239
Physical extent 99842 to 119233:
Logical volume /dev/home/windows-persistent_rimage_0
Logical extents 38400 to 57791
Physical extent 119234 to 122045:
FREE
--- Physical volume ---
PV Name /dev/nvme1n1p1
VG Name home
PV Size 465.76 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 119234
Free PE 0
Allocated PE 119234
PV UUID 1dmaeN-j0D3-EU60-kQg2-a5t7-CNdP-qpBYyp
--- Physical Segments ---
Physical extent 0 to 51199:
Logical volume /dev/home/dom0-mirror
Logical extents 0 to 51199
Physical extent 51200 to 51200:
Logical volume /dev/home/windows-persistent_rmeta_1
Logical extents 0 to 0
Physical extent 51201 to 81920:
Logical volume /dev/home/windows-persistent_rimage_1
Logical extents 0 to 30719
Physical extent 81921 to 92161:
Logical volume /dev/home/windows-persistent_rimage_1
Logical extents 38400 to 48640
Physical extent 92162 to 99841:
Logical volume /dev/home/windows-persistent_rimage_1
Logical extents 30720 to 38399
Physical extent 99842 to 99842:
Logical volume /dev/home/windows_rmeta_1
Logical extents 0 to 0
Physical extent 99843 to 110082:
Logical volume /dev/home/windows_rimage_1
Logical extents 0 to 10239
Physical extent 110083 to 119233:
Logical volume /dev/home/windows-persistent_rimage_1
Logical extents 48641 to 57791
--- Physical volume ---
PV Name /dev/nvme2n1p1
VG Name home
PV Size <1.82 TiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476931
Free PE 457923
Allocated PE 19008
PV UUID UzD83f-tnya-9wbR-TRrf-qkxe-2lf7-ewF3M7
--- Physical Segments ---
Physical extent 0 to 19007:
Logical volume /dev/home/windows-persistent_rimage_0
Logical extents 57792 to 76799
Physical extent 19008 to 476930:
FREE
--- Physical volume ---
PV Name /dev/nvme3n1p1
VG Name home
PV Size <1.82 TiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476931
Free PE 457923
Allocated PE 19008
PV UUID Rf7CoD-NxTs-ohO3-pqJx-dMZ8-6SCh-SXXhAf
--- Physical Segments ---
Physical extent 0 to 19007:
Logical volume /dev/home/windows-persistent_rimage_1
Logical extents 57792 to 76799
Physical extent 19008 to 476930:
FREE
lvm> vgdisplay
--- Volume group ---
VG Name home
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 209
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 2
Max PV 0
Cur PV 4
Act PV 4
VG Size <4.56 TiB
PE Size 4.00 MiB
Total PE 1195142
Alloc PE / Size 276484 / 1.05 TiB
Free PE / Size 918658 / 3.50 TiB
VG UUID 1QhLGQ-ljr2-p0or-yAiD-530e-17n4-y8VN0d
lvm> lvdisplay
--- Logical volume ---
LV Path /dev/home/dom0
LV Name dom0
VG Name home
LV UUID XKpxWe-g8Rh-faKQ-s8Ht-KPC0-oLHc-tLneqN
LV Write Access read/write
LV Creation host, time home, 2016-07-02 18:55:56 +1000
LV Status available
# open 1
LV Size 200.00 GiB
Current LE 51200
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:0
--- Logical volume ---
LV Path /dev/home/windows-persistent
LV Name windows-persistent
VG Name home
LV UUID 4g6nXt-h6LL-YaHc-wfcU-Iote-rFJd-rpzgeF
LV Write Access read/write
LV Creation host, time home, 2018-01-08 22:18:42 +1100
LV Status available
# open 0
LV Size 300.00 GiB
Current LE 76800
Mirrored volumes 2
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:5
--- Logical volume ---
LV Path /dev/home/dom0-mirror
LV Name dom0-mirror
VG Name home
LV UUID WtfyuY-LRxR-nQBk-ft8C-T1gn-2hvE-TIQLgm
LV Write Access read/write
LV Creation host, time home, 2018-12-06 19:02:41 +1100
LV Status available
# open 1
LV Size 200.00 GiB
Current LE 51200
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:6
--- Logical volume ---
LV Path /dev/home/windows
LV Name windows
VG Name home
LV UUID JKQjjn-4vUO-bwTD-eCl3-eZiM-mato-1R09It
LV Write Access read/write
LV Creation host, time home, 2023-07-06 17:10:07 +1000
LV Status available
# open 0
LV Size 40.00 GiB
Current LE 10240
Mirrored volumes 2
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:11
pvs/ vgs/lvs输出：
lvm> pvs
PV VG Fmt Attr PSize PFree
/dev/nvme0n1p2 home lvm2 a-- 476.74g 10.98g
/dev/nvme1n1p1 home lvm2 a-- <465.76g 0
/dev/nvme2n1p1 home lvm2 a-- <1.82t <1.75t
/dev/nvme3n1p1 home lvm2 a-- <1.82t <1.75t
lvm> vgs
VG #PV #LV #SN Attr VSize VFree
home 4 4 0 wz--n- <4.56t 3.50t
lvm> lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
dom0 home -wi-ao---- 200.00g
dom0-mirror home -wi-ao---- 200.00g
windows home rwi-aor--- 40.00g 100.00
windows-persistent home rwi-aor--- 300.00g 100.00
答案1
由于pvmove试图防止将两个镜像移动到同一个 PV 而减少冗余（例如，一个 PV 不应同时包含_rimage_0和_rimage_1子 LV），因此组合/共置同一镜像的不同部分的唯一*方法是逐个移动每个子 LV，并且仅按名称移动。
由于当前错误非常隐晦，我向 LVM 提出了 PR 以改进消息传递：https://github.com/lvmteam/lvm2/pull/126
* 也许可以绕过--alloc anywhere，但我还没有尝试过
除此之外，pvmove在“允许同一镜像的各个部分共置”代码中最终出现了一个错误，导致它无法正常工作。在上面的同一个 PR 中，我修复了这个错误
最终通过上述修复，我最终运行以下命令来成功移动我的 LV：
pvmove -n home/windows-persistent_rmeta_0 /dev/nvme0n1p2 /dev/nvme2n1p1
pvmove -n home/windows-persistent_rimage_0 /dev/nvme0n1p2 /dev/nvme2n1p1
pvmove -n home/windows-persistent_rmeta_1 /dev/nvme1n1p1 /dev/nvme3n1p1
pvmove -n home/windows-persistent_rimage_1 /dev/nvme1n1p1 /dev/nvme3n1p1